Leaking Carbon Steel Weldments in a Sulfur Recovery Unit
Two leaks were discovered at a sulfur recovery unit in a refinery. The leaks were at pipe-to-elbow welds in a 152 mm (6 in.) (NPS 6) diam line, operating in lean amine service at 50 deg C (120 deg F) and 2.9 MPa (425 psig). Thickness measurements indicated negligible loss of metal, and the leaks were clamped. A year later, 15 additional leaks were discovered, again at pipe-to-elbow welds in lean amine lines. Further nondestructive testing located other cracks, giving a total of 35. These lines had been in service for approximately eight years. Investigation (visual inspection, hardness testing,...
Leaking Carbon Steel Weldments in a Sulfur Recovery Unit, ASM Failure Analysis Case Histories: Oil and Gas Production Equipment, ASM International, 2019, https://doi.org/10.31399/asm.fach.petrol.c0091594
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